Java中导出Excel数据，封装Bean

在Java中封装导出Excel数据的总体思路为:

1.导出，根据查询得到的数据（一般我们页面上用的是查询条件带分页的），我们需要把查询条件带到后台重新查询，并且是查询全部数据，不带分页

2.不能用ajax异步提交。应该用location.href=""的方式，把处理的流交给浏览器来处理，JS无法处理流计算。

3.封装统一的Bean实体，主要输入导出的列名，excel名，数据集即可导出。

用到的Maven地址：

         <!-- poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.13</version>
        </dependency>


            <dependency>
        	<groupId>jexcelapi</groupId>
        	<artifactId>jxl</artifactId>
        	<version>2.6</version>
        </dependency>

 ExcelBean：

public class ExcelBean {
    
    private String name;
    
    private String sheetName;
    
    private ExcelTitle[] titles;
    
    private List<String[]> dataList;
    
    private boolean headBold = true;
    
    /**
     * 列宽 （像素）
     */
    private int columnWidth = 200;
    
    private int rowHeight;
    
    public ExcelBean(String name, String sheetName, ExcelTitle[] titles){
        this.name = name;
        this.sheetName = sheetName;
        this.titles = titles;
        this.dataList = new ArrayList<String[]>();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSheetName() {
        return sheetName;
    }

    public void setSheetName(String sheetName) {
        this.sheetName = sheetName;
    }

    public ExcelTitle[] getTitles() {
        return titles;
    }

    public void setTitles(ExcelTitle[] titles) {
        this.titles = titles;
    }

    public List<String[]> getDataList() {
        return dataList;
    }

    public void setDataList(List<String[]> dataList) {
        this.dataList = dataList;
    }
    
    public boolean isHeadBold() {
        return headBold;
    }

    public void setHeadBold(boolean headBold) {
        this.headBold = headBold;
    }

    public int getColumnWidth() {
        return columnWidth;
    }

    public void setColumnWidth(int columnWidth) {
        this.columnWidth = columnWidth;
    }

    public int getRowHeight() {
        return rowHeight;
    }

    public void setRowHeight(int rowHeight) {
        this.rowHeight = rowHeight;
    }

    public void add(String[] data){
        this.dataList.add(data);
    }
    

}

 ExcelBox：

/**
 * excel 块状区域
 * @author 
 *
 */
public class ExcelBox {
    private int x1;
    
    private int y1;
    
    private int x2;
    
    private int y2;
    
    public ExcelBox(int width, int height, int colWidth, int rowHeight, int padding){
        double ratio = 1;
        int innerWidth = colWidth - 2 * padding;
        int innerHeight = rowHeight - 2 * padding; 
        if((double) width / height > (double) innerWidth/ innerHeight){
            if(width > innerWidth){
                ratio = (double) innerWidth / width;
            }
        }
        else{
            if(height > innerHeight){
                ratio = (double) innerHeight / height;
            }
        }
        
        int boxWidth = (int)(width * ratio);
        int boxHeight = (int)(height * ratio);
        x1 = (colWidth - boxWidth) / 2;
        y1 = (rowHeight - boxHeight) / 2;
        x2 = x1 + boxWidth;
        y2 = y1+ boxHeight;
    }

    public int getX1() {
        return x1;
    }

    public void setX1(int x1) {
        this.x1 = x1;
    }

    public int getY1() {
        return y1;
    }

    public void setY1(int y1) {
        this.y1 = y1;
    }

    public int getX2() {
        return x2;
    }

    public void setX2(int x2) {
        this.x2 = x2;
    }

    public int getY2() {
        return y2;
    }

    public void setY2(int y2) {
        this.y2 = y2;
    }
}

 ExcelImage：

/**
 * excel 图片
 * @
 *
 */
public class ExcelImage {
    private int width;
    
    private int height;
    
    private byte[] byteArray;
    
    public ExcelImage(String imageUrl) throws IOException{
        BufferedImage bufferedImage = ImageIO.read(new URL(imageUrl));
        ByteArrayOutputStream byteArrayOutputStream =new ByteArrayOutputStream();
        ImageIO.write(bufferedImage,"png", byteArrayOutputStream);
        width = bufferedImage.getWidth();
        height = bufferedImage.getHeight();
        byteArray = byteArrayOutputStream.toByteArray();
        byteArrayOutputStream.close();
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public byte[] getByteArray() {
        return byteArray;
    }

    public void setByteArray(byte[] byteArray) {
        this.byteArray = byteArray;
    }
}

 ExcelTitle：

/**
 * Excel Title
 * @author 
 *
 */
public class ExcelTitle {

    private String value;
    
    /**
     * 列宽（像素）
     */
    private int width;
    
    public static ExcelTitle generate(String value, int width){
        ExcelTitle title = new ExcelTitle();
        title.setValue(value);
        title.setWidth(width);
        return title;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }
}

 工具类 ExcelUtils：

package com.goldensky.common.excelutil;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class excelExport {
    
    
    /*@SuppressWarnings("resource")
    public static void export( ExcelBean excelBean, HttpServletResponse response) throws Exception{
            HSSFWorkbook wb = new HSSFWorkbook();
            HSSFSheet sheet = wb.createSheet(excelBean.getSheetName());
            HSSFRow row = sheet.createRow(0);
            
            //设置样式
            HSSFCellStyle style = wb.createCellStyle();
            if(excelBean.isHeadBold()){
                HSSFFont headfont = wb.createFont(); 
                headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
                style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
                style.setFont(headfont);
            }
            
            HSSFCell cell;
            ExcelTitle[] titles = excelBean.getTitles();
            for(int i=0; i < titles.length; i++){
                ExcelTitle title = titles[i];
                cell= row.createCell(i);
                cell.setCellValue(title.getValue());
                cell.setCellStyle(style);
                int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth();
                sheet.setColumnWidth(i, getColWidth(columnWidth));
            }
            
            int rowNumber = 1;
            int rowHeihgt = excelBean.getRowHeight();
            HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
            for(String[] data : excelBean.getDataList()){
                row = sheet.createRow(rowNumber ++ );
                if(rowHeihgt > 0){
                    row.setHeight((short) getRowHeight(rowHeihgt));
                }
                else{
                    rowHeihgt = 18;
                }
                for(int j=0; j<data.length; j ++){
                    String value = data[j];
                    cell = row.createCell(j);
                    
                    if(isUrl(value)){
                        if(isImage(value)){
                            int columnWidth = titles[j].getWidth() > 0 ? titles[j].getWidth() : excelBean.getColumnWidth();
                            ExcelImage excelImage = new ExcelImage(value);
                            ExcelBox excelBox = new ExcelBox(excelImage.getWidth(), excelImage.getHeight(), rowHeihgt, columnWidth, 10);
                            HSSFClientAnchor anchor = new HSSFClientAnchor();
                            int cw = getColWidth(columnWidth);
                            int rh = getRowHeight(rowHeihgt);
                            short col = (short)(j);
                            int rowNum = rowNumber-1;
                            anchor.setDx1(getAnchorX(excelBox.getX1(), cw));
                            anchor.setDy1(getAnchorY(excelBox.getY1(), rh));
                            anchor.setDx2(getAnchorX(excelBox.getX2(), cw));
                            anchor.setDy2(getAnchorY(excelBox.getY2(), rh));
                            anchor.setCol1(col);
                            anchor.setRow1(rowNum);
                            anchor.setCol2(col);
                            anchor.setRow2(rowNum);
                            
                            anchor.setAnchorType(0);
                            patriarch.createPicture(anchor , wb.addPicture(excelImage.getByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
                        }
                        else{
                            cell.setCellValue(value);
                            cell.setCellFormula("HYPERLINK("" + value + "","" + value + "")");
                            HSSFCellStyle linkStyle = wb.createCellStyle();
                            HSSFFont cellFont= wb.createFont();
                            cellFont.setUnderline((byte) 1);
                            cellFont.setColor(HSSFColor.BLUE.index);
                            linkStyle.setFont(cellFont);
                            linkStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                            cell.setCellStyle(linkStyle);
                        }
                    }
                    else{
                        cell.setCellValue(value);
                        HSSFCellStyle cellStyle = wb.createCellStyle();
                        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                        cell.setCellStyle(cellStyle);
                    }
                }
            }
            
            response.setContentType("application/octet-stream;charset=utf-8");
            response.setCharacterEncoding("utf-8");
            
            String filename = excelBean.getName();
            filename = new String(filename.replaceAll("\s|;", "").getBytes("gbk"), "ISO8859-1");
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition", "attachment;filename=" + filename);
            OutputStream ouputStream = response.getOutputStream();   
            wb.write(ouputStream);
            ouputStream.flush();   
            ouputStream.close();  
        }*/
    
    
    @SuppressWarnings("resource")
    public static void export( ExcelBean excelBean, HttpServletResponse response) throws Exception{
        
            
            HSSFWorkbook wb = new HSSFWorkbook();
            HSSFSheet sheet = wb.createSheet(excelBean.getSheetName());
            HSSFRow row = sheet.createRow(0);
            
            //设置样式
            HSSFCellStyle style = wb.createCellStyle();
            if(excelBean.isHeadBold()){
                HSSFFont headfont = wb.createFont(); 
                headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
                style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
                style.setFont(headfont);
            }
            
            HSSFCell cell;
            ExcelTitle[] titles = excelBean.getTitles();
            for(int i=0; i < titles.length; i++){
                ExcelTitle title = titles[i];
                cell= row.createCell(i);
                cell.setCellValue(title.getValue());
                cell.setCellStyle(style);
                int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth();
                sheet.setColumnWidth(i, getColWidth(columnWidth));
            }
            
            int rowNumber = 1;
            int rowHeihgt = excelBean.getRowHeight();
            HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
            for(String[] data : excelBean.getDataList()){
                row = sheet.createRow(rowNumber ++ );
                if(rowHeihgt > 0){
                    row.setHeight((short) getRowHeight(rowHeihgt));
                }
                else{
                    rowHeihgt = 18;
                }
                for(int j=0; j<data.length; j ++){
                    String value = data[j];
                    cell = row.createCell(j);
                    
                    if(isUrl(value)){
                        if(isImage(value)){
                            int columnWidth = titles[j].getWidth() > 0 ? titles[j].getWidth() : excelBean.getColumnWidth();
                            ExcelImage excelImage = new ExcelImage(value);
                            ExcelBox excelBox = new ExcelBox(excelImage.getWidth(), excelImage.getHeight(), rowHeihgt, columnWidth, 10);
                            HSSFClientAnchor anchor = new HSSFClientAnchor();
                            int cw = getColWidth(columnWidth);
                            int rh = getRowHeight(rowHeihgt);
                            short col = (short)(j);
                            int rowNum = rowNumber-1;
                            anchor.setDx1(getAnchorX(excelBox.getX1(), cw));
                            anchor.setDy1(getAnchorY(excelBox.getY1(), rh));
                            anchor.setDx2(getAnchorX(excelBox.getX2(), cw));
                            anchor.setDy2(getAnchorY(excelBox.getY2(), rh));
                            anchor.setCol1(col);
                            anchor.setRow1(rowNum);
                            anchor.setCol2(col);
                            anchor.setRow2(rowNum);
                            
                            anchor.setAnchorType(0);
                            patriarch.createPicture(anchor , wb.addPicture(excelImage.getByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
                        }
                        else{
                            cell.setCellValue(value);
                            cell.setCellFormula("HYPERLINK("" + value + "","" + value + "")");
                            HSSFCellStyle linkStyle = wb.createCellStyle();
                            HSSFFont cellFont= wb.createFont();
                            cellFont.setUnderline((byte) 1);
                            cellFont.setColor(HSSFColor.BLUE.index);
                            linkStyle.setFont(cellFont);
                            linkStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                            cell.setCellStyle(linkStyle);
                        }
                    }
                    else{
                        cell.setCellValue(value);
                        HSSFCellStyle cellStyle = wb.createCellStyle();
                        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                        cell.setCellStyle(cellStyle);
                    }
                }
            }
            
            response.setContentType("application/octet-stream;charset=utf-8");
            response.setCharacterEncoding("utf-8");
            
            String filename = excelBean.getName();
            filename = new String(filename.replaceAll("\s|;", "").getBytes("gbk"), "ISO8859-1");
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition", "attachment;filename=" + filename);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            wb.write(out);
            byte[] ret = out.toByteArray();
            out.flush();
            out.close();
            
            FileUpDown file = new FileUpDown();
            file.download(filename,
                    ret, response);
        }
        
        
        /**
         * 获取图片x方向长度坐标转换
         * @param px
         * @param colWidth
         * @return
         */
        public static  int getAnchorX(int px, int colWidth){  
            return (int) Math.round(( (double) 701 * 16000.0 / 301)*((double)1/colWidth)*px);  
        }  
        
        /**
         * 获取图片y方向长度坐标转换
         * @param px
         * @param rowHeight
         * @return
         */
        public static int getAnchorY(int px, int rowHeight){  
            return (int) Math.round(( (double) 144 * 8000 / 301)*((double)1/rowHeight)*px);  
        }  
          
        /**
         * 行高转换
         * @param px
         * @return
         */
        public static int getRowHeight( int px ){  
            return (int) Math.round(((double) 4480 / 300 ) * px);  
        }
        
        /**
         * 列宽转换
         * @param px
         * @return
         */
        public static int getColWidth( int px ){  
            return (int) Math.round(((double) 10971 / 300 ) * px);  
        }
        
        /**
         * 判断是否为链接地址
         */
        public static boolean isUrl(String string){
            Pattern pattern = Pattern.compile("^((http|https):\/\/([\w\-]+\.)+[\w\-]+(\/[\w\u4e00-\u9fa5\-\.\/?\@\%\!\&=\+\~\:\#\;\,]*)?)", Pattern.CASE_INSENSITIVE );
            return pattern.matcher(string).matches();
        }
        
        /**
         * 判断是否为图片
         */
        public static boolean isImage(String string){
            Pattern pattern = Pattern.compile("\S+\.(jpg|jpeg|png|gif|bmp)(\?\S+)?$", Pattern.CASE_INSENSITIVE );
            return isUrl(string) && pattern.matcher(string).matches();
        }


}

 下载类，FileUpDown：

package com.goldensky.common.excelutil;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

public class FileUpDown {


    
    
    
    /**
     * 导出文件，注意：导出后缓存将被删除
     * 
     * @param fileName 文件名
     * @param buffer 文件内容缓存
     * @param response HttpServletResponse对象
     * @return 如果出错返回错误信息
     */
    public static String download(String fileName, byte[] buffer, HttpServletResponse response)
    {
        String ret = "";
        javax.servlet.ServletOutputStream outputStream = null;
        try
        {
            
            if (buffer != null && buffer.length > 0)
            {
                String strFileName = new String(fileName.getBytes("utf-8"), "utf-8");
                
                response.reset();
                response.setContentType("application/x-download");
                
                response.setHeader("Content-Disposition", "attachment; filename="" + strFileName + """);
                
                int length = buffer.length;
                
                outputStream = response.getOutputStream();
                outputStream.write(buffer, 0, length);
                outputStream.flush();
                
                outputStream.close();
                response.setStatus(HttpServletResponse.SC_OK);
                response.flushBuffer();
            }
            
        }
        catch (Exception e)
        {
        }
        finally
        {
            buffer = null;
        }
        return ret;
    }
    
    
    /**
     * 下载数组内容到客户端一文件
     */
    public static void download(HttpServletResponse response, HttpServletRequest request, byte[] buffer,
        String strFileName)
    {
        try
        {
            
            // strFileName = new String( strFileName.getBytes("Big5"),
            // "ISO8859_1" ));
            strFileName = new String(strFileName.getBytes("gb2312"), "iso-8859-1");
            
            response.reset();
            response.setContentType("application/x-download");
            
            // if (request.getHeader("User-Agent").indexOf("MSIE 5.5") != -1) {
            // ... IE5.5不能加上 attachment;
            response.setHeader("Content-Disposition", "attachment; filename="" + strFileName + """);
            
            int length = buffer.length;
            
            ServletOutputStream outputStream = response.getOutputStream();
            outputStream.write(buffer, 0, length);
            
            outputStream.flush();
            outputStream.close();
            
            response.setStatus(HttpServletResponse.SC_OK);
            response.flushBuffer();
            
        }
        catch (Exception e)
        {
        }
    }
}


                          

 调用示例：

 前台：

　　

  //导出Excel数据
    function  exportexcel()
    {
    	var drvalue=$("#drstatus").combobox('getValue');
    	location.href="${localCtx }/approvaloption/export.do?flowstatus="+drvalue+"&&roleid="+${sysUser.userrole.nRoleId}+"";
    }

 后台调用：

@RequestMapping(value="export.do")
	public  void exportExcel(String flowstatus,Long roleid,HttpServletResponse response)
	{
		Long status=(null!=flowstatus&&!"".equals(flowstatus))?Long.parseLong(flowstatus):null;
		List<Flow> list=flowService.getList(roleid,status);
		
		
		 ExcelTitle[] titles = {
	               ExcelTitle.generate("流程名称", 60), 
	               ExcelTitle.generate("流程描述", 100),
	               ExcelTitle.generate("流程节点名称", 100),
	               ExcelTitle.generate("审批人", 100),
	               ExcelTitle.generate("通行证类型", 100),
	               ExcelTitle.generate("号牌号码", 100),
	               ExcelTitle.generate("车辆使用单位", 100),
	               ExcelTitle.generate("业务类别", 100),
	               ExcelTitle.generate("审批状态", 100),
		 
		 			};
	       SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
	       String fileName = format.format(Calendar.getInstance().getTime())+"审核结果.xls"; 
	       ExcelBean excelBean = new ExcelBean(fileName, "统计", titles);
	       for(Flow fl : list){
	          
	    	   String flowname=fl.getFd().getFlowName();
	    	   String flowdesc=fl.getFd().getFlowDesc();
	    	   String nodeName=fl.getFn().getNodeNames();
	    	   String spr=fl.getT().getRoleName();
	    	   String txzlx=fl.getDic().getDmsm1();
	    	   String hphm=fl.getTp().getHphm();
	    	   String clsydw=fl.getTp().getClsydw();
	    	   String ywlb=(fl.getTp().getYwlb()==1)?"业务申请":"延期";
	    	   String splc=(fl.getApproveStatus()==1L)?"未审批":"已审批";
	    	   excelBean.add(new String[]{flowname,flowdesc,nodeName,spr,txzlx,hphm,clsydw,ywlb,splc});
	       }
	       try {
	    	   excelExport.export(excelBean, response);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}